Issues regarding the selection of flow velocity in pipelines, safe flow velocities, and recommended flow velocities corresponding to pipe diameters
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The last edit to this post was made by hhhljc on 2017-12-13 at 10:32, in post 20570, where the safe flow rate for pipes was discussed. Recommended safe flow velocities corresponding to pipe diameters: There are some contradictions between these two approaches to determining flow velocities. How should the flow velocity in a pipe be determined? Are there more detailed standard specifications?
The one below was found on Baidu Wenku; I’m not sure what the criteria are. Is the flow rate generally determined based on the value of 20570, and does it have nothing to do with the pipe diameter?
Logically, the pipe diameter should be chosen based on the flow rate
For corresponding media, the recommended flow rates for the same pipe diameter vary. Also, the table below you shows the water pipes; take a close look. Refer to the table above, but it is not comprehensive.
First, determine the flow rate and the medium; select the flow velocity based on the medium, and finally choose the pipe diameter according to the flow rate and flow velocity
For generally non-flammable, non-corrosive, and non-toxic media, there is no specific safe flow rate; the flow rate is determined based on the pressure drop.